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arXiv 0708.0797hep-th
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β变形理论中的BPS威尔逊圈附近

Near BPS Wilson Loop in beta-deformed Theories

Chong-Sun Chu, Dimitrios Giataganas

摘要:

提出了N=1 β变形超对称Yang-Mills理论中威尔逊圈算子的定义.虽然该算子不是BPS算子,但它有一个至少达到(g^2 N)^2阶的有限期望值。对于期望值为UV发散的一般非BPS威尔逊圈,通常不会发生这种情况。由于这个原因,我们称之为近BPS威尔逊圈,并推测它的精确期望值是有限的。我们导出了对偶弦世界单所满足的边界条件的一般形式,并发现它是变形的。威尔逊圈的期望值的精确性,以及Lunin-Maldacena度规和B场的一些相当显著的性质,使得边界条件被确定为一个由变形超引力度规的vielbein所表征的边界条件。威尔逊圈运营商提供了自然的候选人作为对偶描述的一些现有的D-膜配置在Lunin-Maldacena的背景。我们还构造了近1/4 BPS圆威尔逊圈算符的弦对偶组态。弦位于一个变形的三球面上,而不是像未变形的情况下那样位于一个二球面上。利用AdS/CFT对应关系计算了威尔逊圈算子的期望值,发现它与形变无关。我们推测,威尔逊圈的精确期望值是由相同的矩阵模型在未变形的情况下。

英文摘要:

We propose a definition of the Wilson loop operator in the N=1 beta-deformed supersymmetric Yang-Mills theory. Although the operator is not BPS, it has a finite expectation value at least up to order (g^2 N)^2. This does not happen generally for a generic non-BPS Wilson loop whose expectation value is UV divergent. For this reason we call this a near-BPS Wilson loop and conjecture that its exact expectation value is finite. We derive the general form of the boundary condition satisfied by the dual string worldsheet and find that it is deformed. Finiteness of the expectation value of the Wilson loop, together with some rather remarkable properties of the Lunin-Maldacena metric and the B-field, fixes the boundary condition to be one which is characterized by the vielbein of the deformed supergravity metric. The Wilson loop operators provide natural candidates as dual descriptions to some of the existing D-brane configurations in the Lunin-Maldacena background. We also construct the string dual configuration for a near-1/4 BPS circular Wilson loop operator. The string lies on a deformed three-sphere instead of a two-sphere as in the undeformed case. The expectation value of the Wilson loop operator is computed using the AdS/CFT correspondence and is found to be independent of the deformation. We conjecture that the exact expectation value of the Wilson loop is given by the same matrix model as in the undeformed case.

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